Femto Base Station CSG Identity Correlation for Handover
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Solution Overview
Problem
Current wireless communication systems face challenges in seamlessly managing handovers and communication establishment between user equipment and CSG femto base stations, particularly in heterogeneous networks where multiple PLMN providers share resources, leading to complexities in identity management and service authorization.
Innovation Solution
The proposed solution involves broadcasting correlated PLMN and CSG identities by femto base stations, allowing user equipment to select authorized identities, and facilitating communication and handover processes through an evolved packet core, while enabling shared operation among multiple PLMN providers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a femto base station broadcasts multiple PLMN identities and CSG identities for shared operation among multiple providers, then network flexibility and service authorization are enhanced, but device complexity and identity management complexity increase
Solution Approach 1:
The patent segments the identity management by separating PLMN identities (representing different network providers) from CSG identities (representing closed subscriber groups). The femto base station broadcasts multiple PLMN identities and corresponding CSG identities in a structured manner, allowing user equipment to selectively process identities based on their subscription status. This segmentation reduces the complexity of managing multiple provider identities while maintaining network flexibility.
Solution Approach 2:
The femto base station performs preliminary action by pre-configuring and broadcasting multiple PLMN identities and associated CSG identities before user equipment arrives. This allows user equipment to perform measurements and evaluate signal quality from neighboring cells in advance, identifying suitable target cells for handover before actual handover is needed, thereby reducing handover latency and complexity.
2Productivity
If user equipment performs measurements and selects target CSG femto cells for handover, then handover efficiency is improved, but measurement and detection difficulty increases due to multiple identity correlations
Solution Approach 1:
The patent introduces the evolved packet core (EPC) as an intermediary that manages the correlation between PLMN identities and CSG identities. When user equipment needs to perform handover, it reports measurement results to the source base station, which then communicates with the EPC to resolve identity correlations and determine the appropriate target cell. This intermediary approach simplifies the detection and measurement process for user equipment while maintaining efficient handover operations.
3Reliability
If the femto base station establishes communication based on selected PLMN and CSG identities through the evolved packet core, then service authorization accuracy is improved, but communication establishment time increases
Solution Approach 1:
The patent applies preliminary action by having the femto base station pre-configure and store the correlations between multiple PLMN identities and CSG identities before communication establishment. When user equipment initiates connection, the base station can quickly match the selected identities against pre-configured data, reducing the time required for service authorization while maintaining high accuracy through the structured identity correlation management.
Data Source
AI summary
Disclosed is an operating method of a femto base station which includes broadcasting a plurality of public land mobile network (PLMN) identities; broadcasting a plurality of closed subscriber group (CSG) identities correlated with the plurality of PLMN identities; and establishing wireless communication with user equipment based on the broadcasted PLMN and CSG identities.